var API_KEY = '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'

var sendgrid  = require('sendgrid')(API_KEY);
sendgrid.send({
  to:       'lifeng@xish.com',
  from:     'no-reply@weproduct.com',
  subject:  'Hello World',
  text:     'My first email through SendGrid.'
}, function(err, json) {
  if (err) { return console.error(err); }
  console.log(json);
});